At the end of each session all files produced should be transferred to Exabyte 8mm tape system or via Ethernet to local mainframe for backup. The available disc space on the SESAM workstation is approximately 20Mbytes, representing 8 minutes of speech - this would therefore set a convenient and reasonable maximum to the recording session and represents approximately a 30-40 minutes elapsed time per session. All files produced during the session should also be backed up at the same time - the data is a valuable resource and files are easily lost. The digital audio safety backup tapes produced for each session shall be kept indefinitely as an archive of the session. It is expected that 4 to 6 sessions can be accommodated per tape, and care must be exercised not to over-record a previous session.